Is there anyone that knows date code information on headlights? 1969

were are the date codes on T3s?

There are so many letters and numbers on the headlights I have no ideal what is what. I have a complete set of 4 used T-3 headlights/ buckets and retainers. That I took these out of a 1969 30k GM vehicle in excellent shape no signs of cloudiness all in working order.

as fair as I know from 58-67 T-3 lights had no lines in the triangle, and from 68-75? they had vertical lines in the tirangle.

You are correct.